[BUG] Co-work Windows: sandbox environment leaks into child processes, breaking Unix domain socket IPC (JVM NIO, Gradle, MCP servers affected)

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When any Claude Desktop for windows builds have cowork setup and working, any attempt by CC to create a process that needs a unix domain socket fails, because its running in the restrictive AppContainer environment.

Sample stack:

Caused by: java.io.IOException: Unable to establish loopback connection
	at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:103)
	at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:67)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:569)
	at java.base/sun.nio.ch.PipeImpl.<init>(PipeImpl.java:198)
	at java.base/sun.nio.ch.WEPollSelectorImpl.<init>(WEPollSelectorImpl.java:78)
	at java.base/sun.nio.ch.WEPollSelectorProvider.openSelector(WEPollSelectorProvider.java:33)
	at java.base/java.nio.channels.Selector.open(Selector.java:295)
	at org.gradle.internal.remote.internal.inet.SocketConnection$SocketInputStream.<init>(SocketConnection.java:164)
	at org.gradle.internal.remote.internal.inet.SocketConnection.<init>(SocketConnection.java:62)
	... 34 more
Caused by: java.net.SocketException: Invalid argument: connect
	at java.base/sun.nio.ch.UnixDomainSockets.connect0(Native Method)
	at java.base/sun.nio.ch.UnixDomainSockets.connect(UnixDomainSockets.java:148)
	at java.base/sun.nio.ch.UnixDomainSockets.connect(UnixDomainSockets.java:144)
	at java.base/sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:851)

What Should Happen?

CC should not be running bash commands in the AppContainer environment.

Error Messages/Logs

Steps to Reproduce

1. Try to run a gradle process
2. See error above.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

unknown

Claude Code Version

Claude 1.2.234 (2d1855) 2026-04-01T07:58:22.000Z

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_